Greediness comes when you are not happy with your actual win as a result of which everything become difficult to handle when the situations become altered. A man always plans in trading and investment and set a limit but when greediness comes then there is no value of planning and limits.
Greed doesn't always come when you are not happy or satisfied with the results, but it often surrounds your mind when you already have got some wins but you want to get more because you feel if you could get this much, you can also get more but that's just a misconception and it barely works.
Greed is a bad thing therefore whenever you earned any amount so be careful about them and when you loss then visualize the fact that this occasion of losing money posses the power to teach you a lesson to not repeat these faulty actions again.
A lot of people learn from their mistakes but a lot of them don't, they simply forget what happened last time when they get another opportunity and they become greedy once again and I don't blame them, it's not easy to control greed.
A person cannot be successful until he understands that how bad is this greed that it totally change your success into unbearable defeat. A successful person don't think emotionally because he knows that emotion cannot help him but it can have adverse consequences on the winning percentage.
On very rare occasions, your greed might actually make you gain more success, but it is usually not necessary because greed is an emotion that is felt only when you have already reached a certain level of success, and people need to learn to be happy with the initial success instead of getting greedy.